Refrigerating apparatus.



J. ZANDBR & J. LBVEY. R'BPBIGBRATING APPARATUS.

APPLICATION FILED APB.14,1913.

' Patented July 28, 1914.

SHEETS-SHEET 1.

J. ZANDBR & J. LEVEY.

RBFRIGERATING APPARATUS.

APPLICATION FILED APR.141913.

1,105, 17 1 f Patented July 28, 1.914,

4 SHEETS-SHEET 2.

J. ZANDER & J. LBVEY.

RBFBIGERATING APPARATUS.

APPLICATION FILED APR. 14` 1913.

J. ZANDER L J. LEVEY.

REPRIGERATING APPARATUS.

APPLICATION FILED APR.141913.

Patented July 28, 1914.

4 SHEETS-SHEET 4.

Lingen /n Zan UNITED srAIEs ,PATENT OFFICE.

JOHN ZANDER AND-JOHN LEVEY, or CHICAGO, ILLINOIS; SAID LEVEY AssIGNoR Toi Y SAID zANDER..

REFRIGERATING APPARATUS.

Specification of Letters Patent.

Patented July 28, 1914.`

"appneatin mea apra 14, 191s. serial No. 761,021.

To all whom it may' concern Be it known that we, JOHN ZANpER and JOHNLEVEY, citizens of the United7 States, residing at Chicago, in thecounty of Cook and State of lllinois, have invented a new and usefulImprovement in Refrigerating Apparatus, of which the following isA aspecilication. 4

Our invention relates more particularly toA improvements in anhydrousammonia refrigerating apparatus. 'In apparatus of this type it is commonto provide `a generating chamber for generating the ammoniagas, anabsorbing chamber containing water and into which the ammonia-gas afterpassage through the refrigerating coils is dischargedA for mixturetherewith, with means in said absorbing chamber for cooling the ammonialiquor therein, and a condensingchamber into which the ammonia-,gigasproduced in the Generator is discharged and reduced to liquid conditionpreparatory to its introduction into the refrigerating coils. lt is alsocommon practice to repeatedly use the original charge of ammonia, and asthe ammonia-gas after passing through the re- .rigerating coils isdischarged into the absorbing chamber, it thus becomes necessary toreplenish the supply of ammonia in the generator as it is withdrawntherefrom during the operation of the apparatus, with ammonia from theabsorbing chamber. This is commonly done by pumping the liquor from theabsorbing chamber into the generating chamber and providing for acorresponding flow of liquor from the latter to the absorbing chamber,thus producing a circulation between these chambers which causes theliquor in both to be maintained of approximately equal strength. Thepressure in the generating chamber, however, is relatively high,-usuallyabout one hundred pounds to the square inch, as Compared withsubstantially atmospheric pressure in the absorbing-chamber, and inconstructions as hitherto provided it is necessary to pump the liquorfrom the absorbing-chamber into the generatingchamber, against therelatively high pressure in the latter, thugA rendering necessary theuse of comparatively high-power pumps, the installation and operation ofwhich is attendant with relatively great expense. liurthermore inoperating apparatus as hitherto provided careful attention on the partof vthe operator is required, and the conditions in general attendingits'operation' are such that the cost of mstallatlon and operationrender the use of` such types of apparatus, where a relatively smallcapacity only is needed, prohibitive. f

One of our objects, generally stated, is to provide improvements inapparatus of this type wherein the cost of installation and operationthereof will be greatly reduced and be suiliciently low, as comparedwith apparatus as hitherto constructed, that apparatus of relativelysmall capacity maybe installed and operated with economy.

Another object is to provide improvements in the heat-interchangercommonly employed for causing the liquor during its discharge from thegenerating chamber into the absorbing chamber, to be cooled by thecounter-flow of liquor from the absorbing chamber to thegenerating-chamber, in order that the interchaned liquor shall morenearly approach in temperature the temperature of the liquor into whichit is discharged.

Still another object is to provide an improved construction ot'dehydrater which,

shall be of Simple form, economical of manufacture, and which shalloperate positively to separate the water vapor from the ammonia vaporgenerated in the generating chamber, for preventing water vapor frompassing into the condenser; and still anotherobject is to so improveupon apparatus of the type above referred to as to cause it to be betteradapted for the performance of its work in a positive manner, witheconomy, and with the minimum amount of attention. Referring to theaccompanying drawings: Figure 1 is a view in elevation, partlydiagrammatic, of an apparatus constructed in accordance with ourinvention. Fig. 2 is a longitudinal sectional view of the pumping meansemployed for eifecting the interchanging of liquid in the absorbing andgenerating-cha1nbers- Fig. 3 is a section taken at the line 3 on Fig. 2and viewed in the direction of the arrow. Fig. 4 is a view p in verticalsectional elevation of the generatying chamber, the absorbmg` chambersuperposed thereon, and our improved dehydrating means, the latter beingshown in full elevation. Fig. 5 is a section taken at the line 5 on Fig.4 and viewed in the directipn of the arrow. Fig. 6 is a section taken atthe line 6 on Fig. 4 and viewed in the direction of the arrow, showingthe thermostatic means employed for regulating the heat in thegenerating chamber Fig. is a view in vertical sectional'elevationofourimproved vheat-interchanging device. Fig. 8 is a view in verticalsectional elevation of thc ammonia condenser employed; Fig. 9`

is a sectional view of the vvalve-means operated by the thermostat shownin Fig. 6 for controlling the iowof gas to the burner of the generatingchamber; and Fig. 10, an enlarged section taken at the line 10 on Fig. 1and viewed in the direction of the arrow.

rl`he generating-chamber, represented at 11` is shown as surrounded atits lower end, and supported, as indicated at 12, from a casing 13 whichcontains the means for heating the chamber 11, these means 1n theconstruction illustrated comprising a gasburnerl 14 supplied with gasfrom a suitable source thereof, not shown, through a pipe 15.

The absorbing chamber is represented at 16 and in the constructionillustrated surmounts the generating chamber 11, the bottom plate 17 ofthe former forming the top of the chamber 11. AThe cooling coil of theabsorbing chamber 16 is represented at 18 and is preferably connectedwith a supply of cold water, as hereinafter explained.

The ammonia-gas condensing chamber is represented at 19 and contains acooling coil 20 through which' cold water is eirculated, as hereinafterdescribed, the condensin chamber 19 being connected with the rerigerating coils represented at 21, throughl the medium of a pipe 22containing an expansion-valve represented diagrammatically at 23, andwhich may be of any suitable construction, the discharge-end of the coil21 being connected with a. pipe 24 which opens into the chamber 16 andpreferably terminates in anl annular spray-head 25 located in thelatter, the expansion-valve 23 being preferably so adjusted in practicef as to reduce the pressure in the coil 21 to a degree slightly greaterthan the pressure in the chamber 16.

In accordance with' the preferred illustrated embodiment of ourinvention, We provide a dehydrater in the absorbing chamber 16 which`operates to remove all' water vapors from the ammonia vapors generatedin the chamber 13 before they pass into the condenser 19z the .followingbeing a description of our improved construction for this purpose:Extending upwardly in the chamber 16, and located within theconvolutions of the coil 18, is a series of pipes 26 which open at theirlower ends through the plate 17 and into the chamber l1 and at theiruper ends into a gas-tight box 27, above the cttom of the latter, thebox 27 communieating with the condensing chamber 20 through the medium.`of a pipe 28 open at its opposite ends and which opens at one end intothe chamber 20 and at its o posite end passes through the top of the camber 16 and the top of the box 27 and terminates below the 'tops of thepipes 26 and preferably centrally of the series thereof. A pipe 29 opensat its upper end into the box 27, through the bottom of the latter, andat its lower end'extends through the plate 17 into the chamber 11, thispipe carrying on its 'lower end a cup 30 which communicates with theinterior of the pipe 29 through openings 31 in the side of the latterand thus forms a water seal, as hereinafter described, for preventingammonia-gas from passing from the chamber 11 through the pipe 29.

In the operation of the apparatus, the ammonia-gas generated in thechamber 11 passes therefrom through the tubes 26 into the box 27, thenceinto the pipe 28 and into the condensin chamber 19 where it is reducedto liqui form, any water vapor gen'- erated in the chamber 11 beingcondensed either on the platev 17, which is relatively cool, or 'ln thetubes26, or in the box 27, in the latter case the condensed water vaporsflowing from the box 27 and thence into the cup 30, through the pipe 29,from which cup they overflow into the chamber 11. The liquid ammonia inthe condenser 19 in passing through the expansion valve 23 expands intogaseous condition, thence passing through the coil 21, Where it performsthe refrigerating function in accordance with common practice, and thenby way of the pipe 24 enters the absorbing chamber 16 where it is mixedwith the ammonia liquor therein and the heat thus developed removed bythe cooling effect of the Water in ythe coil 18.

As the ammonia-gas is generated for supplying the coil 21, from theammonia liquor in the chamber 11, and as the discharge from the coil Y21is into the absorbing chamber 16, it is necessary that the liquid inthese chambers be interchanged, and this is accomplished in theconstruction illustrated by my improved circulating means, a descriptionof which is as follows: As a preface to the following description it maybe said that it is well understood in the art that the pressure inthechamber l1 under normal operating conditions isabout one hundred poundsto the square inch, as compared with substaiitially atmospheric pressurein the chamber 16, and thus the interchange of liquid just referred toinvolves the passage of liquid into a chamber wherein the liquid isunder relatively high pressure, from a chamber wherein the liquid isunder substantially no pressure.

The pumping means for producing circulation of the4 liquid isrepresented in Fig. 2, and in the preferred form illustrated comprises:a pair of alining cylinders 31 and 32 containing pistons 33 and 34,respectively,

` connected together by a'rod 35,'r the cylinder 32, and piston 34constituting the pumpproper and the cylinder 31 and piston 33 thedriving means therefor. The ump-casing contains a supplemental cylin er36 containin a piston-valve 37 having openings 38 exten g`longitudinally therethrough, the interior of the cylinder 36 beinconnected at one end with the' correspon mg Iend of the cylinder` 32 bya passagef39 and having ports 40 and 41 opening into'it, as illustrated1n Fig. 2, the ports. 40 and 41 and passa `e 39 being'\so disposed as tocause the port 0 and passage y39 to be in communication with eachotherl\throu h the openings 38 in the piston-valvelrr en the latter isin one po-4 sition, and open the port 41 to the passage 39 and close tothe latter the port 40, when the piston-valve 37 is shifted to anotherposition, as hereinafter described. The valvemeans for controlling thefiow of fluid-pressure into the cylinder 31 to operate the piston 33areof well-known construction, and comprise a casing 42 with inlet andoutlet ports 43 and 44 respectively, the former opening into thecylinder 31 at the opposite ends of the latter, a slide-valve 45 forcontrolling the ports 43 and 44, connected with a rod 46 carr ingpistons 47 and 48 operating in cylin ers 49 and 50, respectively, whichcommunicate behind the pistons therein, with the fluid pressure suppliedthrough relatively small apertures 51 1n the pistons 47 and 48, thesecylinders opening into the respective ends of the cylinder 31 throughthe medium of as sages 52 and 53, respectivel equippedp with outwardlyopening chec (-valves 54 extending into the path of movement of thepiston 33. The pistonvalve 37 is reciprocated in the cylinder 36 for thepurpose hereinafter stated, at the end of each strike of the piston 34,and in the construction illustrated is thus operated from the valvemechanism vjust described, through the medium of a rod 55 which isconnected with the pistons 37 and 47.

IThe end of the cylinder 32 opposite to that equipped with the passage39 contains a port 56 which opens into a chamber 57 com` municating atits upper and lower ends with pipes 58 and 59 respectively, andcontaining.,

ball-valves 60 and 61, the valve 61 opening toward the port 56 and thevalve 60 opening away from the port 56. The pipe 59 opens into thechamber 16 and the pipe 58 opens into my improved heat-interchangingdevice represented at 62 and hereinafter described. The port 40 isconnected with a pipe 63 also opening into the heatsinterchanger 62, andthe port 41 connects with a pipe 64 which opens into the pipe 24 andthus communicates with the interior of the chamber 16.

Our improved heat-interchanger comprises a plurality of concentricallydisposed tubes 65, 66, 67, and 68, shown as four in number, theinnermost tube 65, which connects with the pipe 63 being open at itsbottom 'and opening into the outermost `tube 68 which is connected nearits'upper end with a pipe 69 which extends into the chamf ber 11 nearthe upper end thereof. The tube @,gwhich is closed at its upper end,com- /municates with the pipe 58, the lower end of this tube being openand reaching short of the bottom of the tube 67, this last-referred totube being closed at its upper and lower -ends as vrepresentedandconnected near its upper end with a pipe 70 which opens into the chamber11 and terminates at its lower,

of this chamber.

Thel coil 20 is connected at its upper end with /a pipe 71 which isconnected with the eXhai/ist-port 44 of the pump, and at its lower endwith a pipe 72 whlch opens into the lower end of the coil 18, the latterat its upper end discharging into a pipe 73 which exhausts into a pipe74 which would lead to a sewer. It will thus' be noted that the coils 18and 20 are in series, and to render the operation ofthe apparatus aseconomical as possible, provision is thus made not only for using thewater pressure which would be supplied from a suitable source thereofthrough a pipe 75 to the pump, as a means for producing the desiredcooling action in the condenser and absorbin chamber, but also as themotive power or driving the pump,

The operation of the apparatus in so far as described is as follows:Assuming the apparatus to be empty, the operator would rst charge thegenerating-chamber and absorbing chamber 1.1 and 16, respectively, witha solution of ammonia of about 28 per cent. strength, as is commonlyused. The burner 14 would then be lighted and the pumping) mechanismhereinbefore described started y allowing water pressure to ow into thevalve-casing of the motor, the spent water therefrom flowing through thecoils 18 and 20 of the condensing and absorbing chambers. Under theaction of the heat applied to the chamber 11 theammonia in the. solutiontherein gasifies and passes upwardly through the pipes 26 into the box27 and thence into the pipe 28 from which it -lows into the condensingchamber 19. The ammonia-gas thus produced liquefics at about one hundredpounds pressure when subjected to the cooling eli'ect of the water inthe coil 20, when the water supplied to this coil is of substantiallythe same temperature as water furnished by street-mains, and thus theliquid in the tank 11 in the `operation of the apparatus is under aboutone-hundred pounds pressure. The liquid ammonia in the condensingchamber. 20

escapes past the expansion-valve 23V ermitting it to expand and becomegas wA ich in passing through the coil 21 producesl the desiredrefrigerating action, the lspent aInmonia-gas passing thence through thepipe 24 past a check-valve 76 therein into the spray-head 25 from whichit discharges into the liquor in the absorbing chamber 16, the coolingeffect produced by the coils 18 o erating to absorb the heat produced byt e mixture of the ammonia-gas with the liquor in the chamber 16.

The operation of the pumping mechanism is as follows: Assuming the pumpto be in the position illustrated in Fig. 2, in which case the pistons33 and 34 are moving to the left in Fig. 2 and the piston-valve 37occupies the position therein illustrated, in which position the ports39 and 40 are in communication with each other through the medium of theopenings 38 in thejpistonvalve 37, the piston 34 drives the liquor inthe left-hand end of the cylinder 32 through the passage 56 and past theball 60 into the pipe 53 and thence into the tube 66 from which itdischarges into the tube 67 and thence into the generating chamber 11.The piston 37 being in the position just illustrated', the right-handend of the cylinder 32 is in communication with the generating chamber1'1 through the medium of the' passage 39, the openings 38 in thepiston-valve 37, the port 40, and pipes 65, 68, and 69, and

thus the piston 34, in driving the contents in the left-hand end of thecylinder 32 into the chamber 11, is aided by the exertion of thepressure from the same chamber introduced into the right-hand end of thecylinder, and thus the piston 34 may be driven by relatively 10W ower.the limit of its stroke 'to the left in Fig. 2, it opens the check-valve54 at the left-hand end of the cylinder 31, thus permitting the fluidpressure in the cylinder 49 to escape through the passage 52, port 43and exhaustport 44, with the result of causing the Huid pressure in thevalve-casing to shift the pistons 47 and 4S, and consequently theslidevalve 45, to the left in Fig. 2 to cause the left-hand end of thecylinder 31 to communicate With the Huid pressure supply and the otherend of this cylinder to be open to the exhaust 44, whereupon the pistons33 and 34 move to the right in Fig. 2, the shifting of the pistons 47and 48 to the left in Fig. 2 causing the piston-Valve 37 to shift in thesame direction, thus closing the port 40 and opening the port 41 to theport 39. In the movement of the piston 34 to the right' in Fig. 2, thesuction producd in the left-hand end of the cylinder 32 causes alow-pressure charge of liquor to be sucked from the chamber 16 into theleft-hand end of the cylinder 32 through the pipe 59 and past thervalve61, the liquor which in the operation of the As the piston 33l nearspices ai to thema 'it F1 2 enters the right-hand end of the cylinler"32, exhausting" from'the -latter through the passage 39 and port'.41and 'thencejinto' the pipes 64 and 24 to the'absorbingfchamber 16. Uponthe next reversal'of the movement of the piston 34 the low-pressurelcharge sucked into ythe left-hand end of the cylinder 32 in theoperation just stated is forced into the generating chamber 11 ashereinbefore stated, these operations continuing so long as the pumpactuates. It will be understood from the description just given thatupon each movement of the piston 34 tothe right in Fig. 2 a charge oflow pressure liquor is sucked from the low pressure chamber l116 intothe cylinder 32 and that the charge introduced into the right-hand endof the cylinder 32 from the high pressurechamber 11 in the precedingmovement of the piston, is discharged into the low pressure chamber 16;and that upon each movement of the piston 34 to the left inFig. 2, thelow pressure charge sucked into the cylinder in the previous operationof the piston, will be forced into the high pressure chamber 11 andduring such movement of the piston high pressure liquor Will ow from thechamber 11 into the right-hand end of the cylinder 32, and thus the pumpis never required to force the liquid against ajhigh pressure, and bycirculating the liquor from one of these chambers to the other, thestrength of these liquors is maintained substantially constant.

It is preferred that the volume of that portion of the piston-rod 35which operates in the cylinder 32 be so proportioned relative to thevolume of the ammonia vaporized in the chamber 11 that in the operationof the prmp it will tend to maintain the Water-levels in the chambers 11and 16 approximately constant. Should the liquor, however, in eitherchamber '1I or 16 drop below a predetermined level, determined by theends ofthe pipes 69 and 59, the pump will discontinue to pump liquidfrom such -chamber, but instead will pump gas, and

thus the predetermined liquid-levels 1n these chambers will beautomatically maintained. It will be noted from the foregoing that theliquor discharged lfrom the chamber 11 into chamber 16 through thespray-head 25 is mixed with ammonia gas from the coil 21 before itenters the head 25, thus electing an admixture of liquid and gas beforeIit leaves the head 25 and up'on leaving the latter is sprayed into theliquor in the chamber 16 thus facilitating absorption.

In operating the generator it is necessary that the heat suppliedthereto be sulfliciently low as to prevent the boiling of theWatercontent. of the liquor in the chamber 11, as the presence of waterin the condensing chamber is very apt to-impair the operation of theapparatus. To render the operation izo of the apparatus automatic inthis particular and to prevent the undue heating of the liquor in thechamber 11, we provide thermostatic means, a description of which is asfollows: Located in the pipe 15 is a reciprocatory Valve 77 adapted tolbe yieldingly held to its seat 78 for shutting oft' the burner 14, bymeans of a spring 79, the outer end oi the stem 80 of the valve 77engaging with a lover 81 fulcruined, as indicated at 82, on a bracket 83secured to the pipe 15 and cooperating with a rod 84 loosely confined ina tube 85 extending through the chamber 11 and screwing at its open endinto t-he bracket 83 as represented at 86, its opposite end being closedas indicated at 87, and free to expand and contract.

The rod 84 should be of less co-eficient of expansion than the tube 85,and these parts should be so constructed that the rod 84 may moveinwardly in the tube 85 suliiciently far to permit the valve 77 to closeunder the act-ion of its spring 79 when the temperature of the ammonialiquor in the chamber 11 reaches a predetermined degree, which should beenough lower than the boiling point of Water under one-hundred poundspressure, as to prevent the produc tion of water vapor.

While we have illustrated and describeda particular constructionembodying our invention, we do not wish to be understood as intending tolimit it thereto, as the same may be variously modified and alteredwithout departing from the spirit thereof.

What we claim as new and desire to secure b v Letters Patentis:

1. The combination with chambers adapted to contain iiuid at diil'erentpressures, of a pump for pumping fluid from said low pressure chamberinto said high pressure chamber, and vice versa, and means operatingwhen said pump is discharging into either of said chambers to cause thecharge next Ito be pumped to enter the suction end of the pump from thechamber into which the pump is discharging.

2. .The combination with chambers adapted to contain iuid at differentpressures, of a pump for pumping fluid from said low pressure chamberinto said high pressure chamber, and vice versa, and means operatingwhen said pump is discharging into said high pressure chamber to causefluid from said high-pressure chamber to enter the suction end of thepump, and when said pump is discharging into said low pressure chamberto cause fluid from said low pressure chamber to enter the suction endof the pump.

3. The combination with chambers adapted to contain fluid at dilierentpressures, of a pump for pumping fluid from said low pressure chamberinto said high pressure chamber, and vice versa, comprising a cylinfder, a piston therein, means for actuatili sald piston, pipescommumcatlng withsai chambers, respectively, and opening into one end ofAsaid cylinder, check-valves for controlling said pipes, other pipescommuni'- cating with said chambers, respectively, and valve means foralternately opening said last referred to pipes to, the other end ofsaid cylinder, constructed and arranged to causethe opposite ends ofsaid cylinder to be in communication with one of said cham'- bersduring-the 'operation of the pump, in one direction and in communicationwith the ,other of said chambers during its operation in the otherdirection.

4. The combination with chambers adapted to cont-ain Huid at differentpressures, of a pump for pumping Huid from said low pressure chamberinto said high pressure chamber, and vice versa, comprising a cylinder,al piston in Said cylinder, means for operating said piston, and meansoperating upon 'the movement of the piston .in .one direction to admitHuid from one of said discharge the fluid in the opposite end of saidcylinder into said last referred to chamber, and upon the movement ofthe piston in the opposite direction to discharge the fluid thusintroduced into the cylinder, to the other of said chambers and admitfluid from said last referred to chamber into the opposite end of saidcylinder.

5. The combination with chambers adapted to contain Huid at diierentpressures, of a pump for pumping fluid from said low pressure chamberinto said high pressure chamber and vice versa, comprising a cylinder, apiston therein, means for actuating said piston, pipes communicatingwith said chambers, respectively, and opening into one end of saidcylinder, inwardly and out- Wardly opening check-valves for controllingsaid respective pipes, a valve-chamber in communication with saidcylinder containing ports, pipes communicating with said chambers andports respectively, a valve in vsaid valve chamber for alternatelyopening said ports to the interior of said chambers and to saidcylinder, and means for actuating said valve timed with relation to vthemovement of said piston for causing said cylinder to be in communicationat opposite ends with one of said chambers during the movement of thepiston in one direction and with the other of said chambers upon themovement of the piston in the opposite direction. V

6. The combination with chambers adapted to .contain Huid at differentpressures, of a pump for pumping fluid from said low pressure chamberinto said high pressure chamber and vice versa, comprising a. lcylinder,a piston in said cylinder, means for n"causing fluid from one of saidchambers to iso enter one end of said cylinder in the move-l ment of thepistonin one'direction and force the fluid thus introduced into the.cylinder into the other of said chambers when the pump is moved in theopposite direction, and means operating, upon said last referred tomovement of the piston to Vintroduce into `said cylinder a charge offluid from the chamber into which the 'pump is discharging and upon therst referred to movement of the piston to cause said charge to be forcedinto the other of said chambers.

f7. In refrigerating apparatus, the com` bination of a generatinchamber, an absorbing chamber and de ydrating means in said absorbingchamber and communicating with said generating chamber.

8. In refrigerating apparatus, the combination of a generating chamber,lan absorbing chamber, and pipes in said absorbing chamber opening intosaid nerating chamber, but closed to said absor ing chamber forconducting the ammonia vapor from said generating chamber.

9. In refrigeratmg apparatus, the combi- -nation of a generatingchamber, and. de-

hydrating means comprising a pipe opening at one end into said chamber,a gas-tight box into which said pipe, at-its opposite end,

opens, and a gas-outlet' pipe for said box.

10. In refrigerating apparatus, the combination of a generatingchamber,and dehydratin means comprising a pipe opening at one en into saidchamber, a gas-tight box into which said pipe, at its op osite end,opens, a gas-outlet pipe for said ox, and a water-outlet pipe for saidbox. 1

11. In refrigerating apparatus, the combination of a generating chamber,and vdehydrating means comprlsing a pipe opening at one end into saidchamber, a gas-tight box into which said pipe, at its opposite end,opens, a gas-outlet pipe for said box, a water-outlet pipe for said box,and means for preventing the gas from escaping through saidwater-outlet.

12. In refrigerating apparatus, the combination of a generating chamber,and dehydrating means comprisin a pipe opening at one end into said chamer, a gas-tight box into which said pipe, at its opposite end, opens, agas-outlet pipe for said box, a water-outlet pipe for said box, and awaterseal for said water-outlet for preventing the escape of gas throughsaid water-outlet.

13. In refrigeratmg apparatus, the combination of a generating chamber,and dehydrating means comprising a pipe o ening at one end into saidchamber, a gas-tig tbox into which 'said pipe, at its opposite end,opens, and a gas-outlet pipe for said box depending into the latter. i

14. In refrigerating apparatus, the combination of a generating chamber,and dehydrating means comprising a pipe openingl at one end into saidchamber, a gas-tight box into which said pipe, at its opposite end,opens,A a gas-outlet pipe for said box extending below the top ofthelatter, and a water-outlet pipe for said box.

15. In refrigerating apparatus, the combination of a generating chamber,and dehydrating means comprising a pipe opening at one end vinto saidchamber, a gas-tight box into which said pipe, at its opposite end,opens above the bottom of the latter and a gas-outlet pipe 4for .saidbox extendin below the top of the latter and the top o said {inst-namedpipe.

'16. In refrigerating apparatus, the com- 80 bination of a generatingchamber, and dehydrating means' comprising a pipe opening at one end-into said chamber, a gas-tight box into which said pipe at its oppositeend, opens above the bottom of the latter, a gas- 35 outlet pipe' forsaid box extending below the top .of the latter and the top of saidfirstnamed pipe,'and a water-outlet for said'box.

17.In refrigerating apparatus, the combination of a generating chamber,and de- .90 hydrating-means comprising a pipe opening at one end intosaid chamber, a gas-tight box into which said pipe at its opposite end,opens above the bottom of the latter, a gas- -outlet pipe for said boxextending below the top of the latter and the top of said first- 'namedpipe, a water-outlet pipe communi'- cating with said box, and awater-seal for saidwater-outlet pipe.

- 18. In refrigerating apparatus, the combination of a generatingchamber containing a' gas-outlet, and an absorbing chamber su perposedon said generating chamber, the bottom of said'absorbing chamberconstituting the top of said generating chamber, 10.5 whereby therelatively cool topeof said generating chamber operates to condensewatervapors contacting therewith.I

19. In refrigeratingjapparatus, the combination of a generating chambercontaining a gas-outlet, an absorbing chamber superposed on saidgenerating chamber, the bottom of said absorbing chamber constitutingthe top of said generating chamber, whereby the relatively cool top ofsaid generating 1N bination of a generating chamber, an absorbingchamber, means for condensing the ammonia gas generated in saidfirst-named l chamber, a refrigerating coil connected 'with thesupply'of ammonia in said condenser, a spraying device in said absorbingchamber, means for discharging liquor from said generating chamber intosaidI absorbing chamto be 4supplied to said sprayingfdevice'with.

the gas from said coil before their discharge through said sprayingdevice.

21. In refrigerating apparatus, the combination of a generating chamber,an abf sorbing chamber, means for condensing the ammonia gas generatedin said first-named chamber, a refrigeratng coil connected with thesupply ofammon'ia in said condenser, a

spraymg device in said absorbing chamber,

a pipe for conducting liquor from said generating chamber into saidspraying devicei 15 and a pipe connected withsaid first-name pipe andsaid coil, for the'purpose set forth.

JOHN ZANDER. JOHN LEVEY. In presence of- W. B. DEAnBoizN,

O. C. Avisue.

